# Dr.D vs i4SY

The clearest difference is update cadence: i4SY at every 3 weeks against Dr.D's every 4 months. Dr.D's advantage is iOS requirement (13.0 vs 16.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Dr.D ships an update every 4 months, i4SY every 3 weeks. The most recent releases landed on September 10, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Dr.D | i4SY |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Size | 257 MB | 50 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Raiza Shukoor](https://appshunter.io/developer/1784436423) | [Aysha Sheslyn](https://appshunter.io/developer/1815823335) |

## What reviewers say

### Dr.D

[App page](https://appshunter.io/ios/app/drd/id6739247762)

**Features:** Vision Pro support

**In-app purchases:** none


### i4SY

[App page](https://appshunter.io/ios/app/i4sy/id6746223177)

**In-app purchases:** none


## Frequently asked questions

### Is Dr.D free?

Dr.D is free to download, with no in-app purchases.

### Is i4SY free?

i4SY is free to download, with no in-app purchases.

### Do Dr.D or i4SY have ads?

Neither Dr.D nor i4SY shows ads.

### Which is updated more often, Dr.D or i4SY?

Dr.D ships an update every 4 months, and i4SY every 3 weeks. Most recently, Dr.D was updated on September 10, 2026 and i4SY on September 23, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*